Notation	Name	Description	Status
1	Horizontal visibility		stable
2	Vertical visibility		stable
3	Present weather		stable
4	Past weather (1)		stable
5	Past weather (2)		stable
6	Flight rules		stable
8	Cloud distribution for aviation		stable
9	General weather indicator (TAF/METAR)		stable
10	Cloud cover (total)		stable
11	Cloud amount		stable
12	Cloud type		stable
13	Height of base of cloud		stable
14	Height of top of cloud		stable
15	Pressure at base of cloud		stable
16	Pressure at top of cloud		stable
17	Cloud top description		stable
18	Tendency of runway visual range		stable
19	Significant present or forecast weather		stable
20	Significant recent weather phenomena		stable
21	Type of precipitation		stable
22	Character of precipitation		stable
23	Other weather phenomena		stable
24	Intensity of phenomena		stable
25	Obscuration		stable
26	Character of obscuration		stable
27	Phenomena occurrence		stable
28	Expected change in intensity		stable
29	Rain flag		stable
31	Ice deposit (thickness)		stable
32	Rate of ice accretion (estimated)		stable
33	Cause of ice accretion		stable
34	Sea ice concentration		stable
35	Amount and type of ice		stable
36	Ice situation		stable
37	Ice development		stable
38	Bearing of ice edge		stable
39	Ice distance		stable
40	Evolution of drift snow		stable
41	Airframe icing		stable
42	Airframe icing present		stable
43	Peak liquid water content		stable
44	Average liquid water content		stable
45	Supercooled large droplet (SLD) conditions		stable
48	Evolution of feature		stable
50	Cloud index		stable
51	Amount of low clouds		stable
52	Amount of middle clouds		stable
53	Amount of high clouds		stable
54	True direction from which a phenomenon or clouds are moving or in which they are observed		stable
55	State of sky in the tropics		stable
56	Cloud phase		stable
58	Visibility seawards from a coastal station		stable
59	Minimum horizontal visibility		stable
60	Prevailing horizontal visibility		stable
61	Runway visual range (RVR)		stable
62	State of the ground (with or without snow)		stable
63	Special phenomena		stable
65	Snow cover		stable
66	Maximum diameter of hailstones		stable
67	Diameter of deposit		stable
70	Minimum number of atmospherics		stable
71	Accuracy of fix and rate of atmospherics		stable
81	Cloud amount in segment		stable
82	Amount segment cloud free		stable
83	Amount of segment covered by scene		stable
85	General condition of runway		stable
86	Runway deposits		stable
87	Runway contamination		stable
88	Depth of runway deposits		stable
89	Runway friction coefficient		stable
90	Special clouds		stable
91	Vertical visibility		stable
92	Height of base of cloud		stable
93	Height of inversion		stable
95	Ice probability		stable
96	Ice age (``A`` parameter)		stable
101	Locust (acridian) name		stable
102	Locust (maturity) colour		stable
103	Stage of development of locusts		stable
104	Organization state of swarm or band of locusts		stable
105	Size of swarm or band of locusts and duration of passage of swarm		stable
106	Locust population density		stable
107	Direction of movements of locust swarm		stable
108	Extent of vegetation		stable
111	x-axis error ellipse major component		stable
112	y-axis error ellipse minor component		stable
113	z-axis error ellipse component		stable
114	Angle of x-axis in error ellipse		stable
115	Angle of z-axis in error ellipse		stable
116	Emission height of cloud stroke		stable
117	Amplitude of lightning strike		stable
118	Lightning detection error		stable
119	Lightning discharge polarity		stable
121	Threshold value for polarity decision		stable
122	Threshold value for polarity decision		stable
123	Minimum threshold for detection		stable
124	Lightning stroke or flash		stable
126	Lightning rate of discharge		stable
127	Lightning - distance from station		stable
128	Lightning - direction from station		stable
130	Cloud hydrometeor concentration		stable
131	Effective radius of cloud hydrometeors		stable
132	Cloud liquid water content		stable
133	Hydrometeor radius		stable
135	Ice mass (on a rod)		stable
136	Supplementary cloud type		stable
137	Evolution of clouds		stable